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Summary: Ctors | Protected Methods | Inherited Methods

# URLStreamHandler

`public abstract class URLStreamHandler`
`extends Object` ``

java.lang.Object
↳ | java.net.URLStreamHandler

The abstract class `URLStreamHandler` is the common superclass for all stream protocol handlers. A stream protocol handler knows how to make a connection for a particular protocol type, such as `http` or `https`.

In most cases, an instance of a `URLStreamHandler` subclass is not created directly by an application. Rather, the first time a protocol name is encountered when constructing a `URL`, the appropriate stream protocol handler is automatically loaded.

See also:

- `URL.URL(java.lang.String, java.lang.String, int, java.lang.String)`

## Summary

### Public constructors
`URLStreamHandler()`

### Protected methods
`boolean` | `equals(URL u1, URL u2)` Provides the default equals calculation.
`int` | `getDefaultPort()` Returns the default port for a URL parsed by this handler.
`InetAddress` | `getHostAddress(URL u)` Get the IP address of our host.
`int` | `hashCode(URL u)` Provides the default hash calculation.
`boolean` | `hostsEqual(URL u1, URL u2)` Compares the host components of two URLs.
`abstract URLConnection` | `openConnection(URL u)` Opens a connection to the object referenced by the `URL` argument.
`URLConnection` | `openConnection(URL u, Proxy p)` Same as openConnection(URL), except that the connection will be made through the specified proxy; Protocol handlers that do not support proxying will ignore the proxy parameter and make a normal connection.
`void` | `parseURL(URL u, String spec, int start, int limit)` Parses the string representation of a `URL` into a `URL` object.
`boolean` | `sameFile(URL u1, URL u2)` Compare two urls to see whether they refer to the same file, i.e., having the same protocol, host, port, and path.
`void` | `setURL(URL u, String protocol, String host, int port, String file, String ref)` This method is deprecated. Use setURL(URL, String, String, int, String, String, String, String);
`void` | `setURL(URL u, String protocol, String host, int port, String authority, String userInfo, String path, String query, String ref)` Sets the fields of the `URL` argument to the indicated values.
`String` | `toExternalForm(URL u)` Converts a `URL` of a specific protocol to a `String`.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### URLStreamHandler

    public URLStreamHandler ()

## Protected methods

### equals

    protected boolean equals (URL u1,
                    URL u2)

Provides the default equals calculation. May be overidden by handlers for other protocols that have different requirements for equals(). This method requires that none of its arguments is null. This is guaranteed by the fact that it is only called by java.net.URL class.

Parameters
`u1` | `URL`: a URL object
`u2` | `URL`: a URL object

Returns
`boolean` | `true` if the two urls are considered equal, ie. they refer to the same fragment in the same file.

### getDefaultPort

    protected int getDefaultPort ()

Returns the default port for a URL parsed by this handler. This method is meant to be overidden by handlers with default port numbers.

Returns
`int` | the default port for a `URL` parsed by this handler.

### getHostAddress

    protected InetAddress getHostAddress (URL u)

Get the IP address of our host. An empty host field or a DNS failure will result in a null return.

Parameters
`u` | `URL`: a URL object

Returns
`InetAddress` | an `InetAddress` representing the host IP address.

### hashCode

    protected int hashCode (URL u)

Provides the default hash calculation. May be overidden by handlers for other protocols that have different requirements for hashCode calculation.

Parameters
`u` | `URL`: a URL object

Returns
`int` | an `int` suitable for hash table indexing

### hostsEqual

    protected boolean hostsEqual (URL u1,
                    URL u2)

Compares the host components of two URLs.

Parameters
`u1` | `URL`: the URL of the first host to compare
`u2` | `URL`: the URL of the second host to compare

Returns
`boolean` | `true` if and only if they are equal, `false` otherwise.

### openConnection

    protected abstract URLConnection openConnection (URL u)

Opens a connection to the object referenced by the `URL` argument. This method should be overridden by a subclass.

If for the handler's protocol (such as HTTP or JAR), there exists a public, specialized URLConnection subclass belonging to one of the following packages or one of their subpackages: java.lang, java.io, java.util, java.net, the connection returned will be of that subclass. For example, for HTTP an HttpURLConnection will be returned, and for JAR a JarURLConnection will be returned.

Parameters
`u` | `URL`: the URL that this connects to.

Returns
`URLConnection` | a `URLConnection` object for the `URL`.

Throws
`IOException` | if an I/O error occurs while opening the connection.

### openConnection

    protected URLConnection openConnection (URL u,
                    Proxy p)

Same as openConnection(URL), except that the connection will be made through the specified proxy; Protocol handlers that do not support proxying will ignore the proxy parameter and make a normal connection. Calling this method preempts the system's default ProxySelector settings.

Parameters
`u` | `URL`: the URL that this connects to.
`p` | `Proxy`: the proxy through which the connection will be made. If direct connection is desired, Proxy.NO_PROXY should be specified.

Returns
`URLConnection` | a `URLConnection` object for the `URL`.

Throws
`IOException` | if an I/O error occurs while opening the connection.
`IllegalArgumentException` | if either u or p is null, or p has the wrong type.
`UnsupportedOperationException` | if the subclass that implements the protocol doesn't support this method.

### parseURL

    protected void parseURL (URL u,
                    String spec,
                    int start,
                    int limit)

Parses the string representation of a `URL` into a `URL` object.

If there is any inherited context, then it has already been copied into the `URL` argument.

The `parseURL` method of `URLStreamHandler` parses the string representation as if it were an `http` specification. Most URL protocol families have a similar parsing. A stream protocol handler for a protocol that has a different syntax must override this routine.

Parameters
`u` | `URL`: the `URL` to receive the result of parsing the spec.
`spec` | `String`: the `String` representing the URL that must be parsed.
`start` | `int`: the character index at which to begin parsing. This is just past the '`:`' (if there is one) that specifies the determination of the protocol name.
`limit` | `int`: the character position to stop parsing at. This is the end of the string or the position of the "`#`" character, if present. All information after the sharp sign indicates an anchor.

### sameFile

    protected boolean sameFile (URL u1,
                    URL u2)

Compare two urls to see whether they refer to the same file, i.e., having the same protocol, host, port, and path. This method requires that none of its arguments is null. This is guaranteed by the fact that it is only called indirectly by java.net.URL class.

Parameters
`u1` | `URL`: a URL object
`u2` | `URL`: a URL object

Returns
`boolean` | true if u1 and u2 refer to the same file

### setURL

    protected void setURL (URL u,
                    String protocol,
                    String host,
                    int port,
                    String file,
                    String ref)

This method is deprecated.
Use setURL(URL, String, String, int, String, String, String, String);

Sets the fields of the `URL` argument to the indicated values. Only classes derived from URLStreamHandler are able to use this method to set the values of the URL fields.

Parameters
`u` | `URL`: the URL to modify.
`protocol` | `String`: the protocol name. This value is ignored since 1.2.
`host` | `String`: the remote host value for the URL.
`port` | `int`: the port on the remote machine.
`file` | `String`: the file.
`ref` | `String`: the reference.

Throws
`SecurityException` | if the protocol handler of the URL is different from this one

### setURL

    protected void setURL (URL u,
                    String protocol,
                    String host,
                    int port,
                    String authority,
                    String userInfo,
                    String path,
                    String query,
                    String ref)

Sets the fields of the `URL` argument to the indicated values. Only classes derived from URLStreamHandler are able to use this method to set the values of the URL fields.

Parameters
`u` | `URL`: the URL to modify.
`protocol` | `String`: the protocol name.
`host` | `String`: the remote host value for the URL.
`port` | `int`: the port on the remote machine.
`authority` | `String`: the authority part for the URL.
`userInfo` | `String`: the userInfo part of the URL.
`path` | `String`: the path component of the URL.
`query` | `String`: the query part for the URL.
`ref` | `String`: the reference.

Throws
`SecurityException` | if the protocol handler of the URL is different from this one

### toExternalForm

    protected String toExternalForm (URL u)

Converts a `URL` of a specific protocol to a `String`.

Parameters
`u` | `URL`: the URL.

Returns
`String` | a string representation of the `URL` argument.

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